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详细论述了液晶透镜的设计理论,并在前人已有的工作基础之上改进制作工艺,得到新型单圆孔电极的液晶透镜。与现在已有的单圆孔电极液晶透镜制作工艺相比,改进体现在:使用光刻和盐酸腐蚀的方法,刻蚀ITO基板得到了具有直径为2mm的圆孔图案的上电极;使用聚酰亚胺取代玻璃作为绝缘层。新型透镜的特性是,工作电压可以低至1.1Vrms,焦距范围为20~480mm,响应时间可达到亚毫秒量级,而在500~1100nm范围内透过率稳定在80%以上。通过实验进一步表明:该液晶透镜的点扩展函数(PSF)与理论值接近,且焦距与工作电压成反比例关系。
The design theory of liquid crystal lens is discussed in detail, and the manufacturing process is improved on the basis of previous work of predecessors to obtain a novel liquid crystal lens with a single circular hole electrode. Compared with the existing single-hole electrode liquid crystal lens manufacturing process, the improvements are as follows: using an etching method of photolithography and hydrochloric acid, etching the ITO substrate to obtain an upper electrode with a circular hole pattern with a diameter of 2mm; Imide replaces glass as an insulating layer. The characteristics of the new lens, the operating voltage can be as low as 1.1Vrms, the focal length range of 20 ~ 480mm, the response time can reach sub-millisecond magnitude, and in the 500 ~ 1100nm transmittance stabilized at more than 80%. The experiment further shows that the point spread function (PSF) of the liquid crystal lens is close to the theoretical value, and the focal length is inversely proportional to the working voltage.